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1 ## Copyright (C) 2000 Paul Kienzle |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; if not, write to the Free Software |
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15 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 |
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17 ## -*- texinfo -*- |
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18 ## @deftypefn {Function File} {V =} datevec(date) |
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19 ## @deftypefnx {Function File} {[Y,M,D,h,m,s] =} datevec(date) |
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20 ## Breaks the number of days since Jan 1, 0000 into a year-month-day |
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21 ## hour-minute-second format. By this reckoning, Jan 1, 1970 is day |
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22 ## number 719529. The fractional portion of @code{date} corresponds to the |
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23 ## portion of the given day. If a single return value is requested, |
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24 ## then the components of the date are columns of the matrix @code{V}. |
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25 ## |
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26 ## Note: 32-bit architectures only handle times between Dec 14, 1901 |
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27 ## and Jan 19, 2038, with special handling for 0000-01-01. datenum |
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28 ## returns -1 in case of a range error. |
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29 ## |
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30 ## The parameter @code{P} is needed to convert date strings with 2 digit |
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31 ## years into dates with 4 digit years. 2 digit years are assumed to be |
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32 ## between @code{P} and @code{P+99}. If @code{P} is not given then the |
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33 ## current year - 50 is used, so that dates are centered on the present. |
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34 ## For birthdates, you would want @code{P} to be current year - 99. For |
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35 ## appointments, you would want @code{P} to be current year. |
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36 ## |
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37 ## Dates must be represented as mm/dd/yy or dd-mmm-yyyy. Times must |
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38 ## be hh:mm:ss or hh:mm:ss PM, with seconds optional. These correspond |
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39 ## to datestr format codes 0, 1, 2, 3, 13, 14, 15, 16. |
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40 ## |
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41 ## @seealso{date,clock,now,datestr,datenum,calendar,weekday} |
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42 ## @end deftypefn |
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43 |
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44 function [d,s] = weekday(date,P) |
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45 if (nargin < 1 || nargin > 2) |
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46 usage("d = weekday(date [, P])"); |
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47 endif |
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48 if isstr(date) |
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49 if nargin < 2, P = []; endif |
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50 date = datenum(date, P); |
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51 endif |
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52 d = rem(floor(date)+5,7)+1; |
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53 if nargout == 2, |
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54 global __day_names = ["Sun";"Mon";"Tue";"Wed";"Thu";"Fri";"Sat"]; |
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55 s = __day_names(d,:); |
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56 endif |
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57 endfunction |
